Pressure in left eye

For the past few days I've noticed a strange feeling in my left eye. It feels like pressure that causes me to keep blinking or adjust my eye. It's not painful, just weird. I feel it slightly behind my right eye as well, but not as much. I don't wear glasses or contacts. I did have Lasik about three years ago but haven't experienced any problems from it. Could this be sinus pressure or allergies? I do have bad allergies and our weather here in the Denver areas has been rainy/snowy for a few days.

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